Search results for: Masaru Kubo

Items from 1 to 14 out of 14 results

article

Usefulness of myeloperoxidase as a biomarker for the ranking of pulmonary toxicity of nanomaterials

Taisuke Tomonaga, Hiroto Izumi, Yukiko Yoshiura, Toshihiko Myojo, more

Particle and Fibre Toxicology > 2018 > 15 > 1 > 1-14

Background In order to examine whether myeloperoxidase (MPO) can be a useful marker for evaluating the pulmonary toxicity of nanomaterials, we analyzed MPO protein in bronchoalveolar lavage fluid (BALF) samples obtained from previous examinations of a rat model. In those examinations we performed intratracheal instillation exposures (dose: 0.2–1.0 mg) and inhalation exposures (exposure concentration:...

article

Effect of annealing temperature on the photocatalytic activity of Ag–TiO2 nanocomposite films by one-step gas-phase deposition

K. Kusdianto, Dianping Jiang, Masaru Kubo, Manabu Shimada

Materials Research Bulletin > 2018 > 97 > C > 497-505

Ag–TiO₂ nanoparticulate composite films were fabricated in the gas phase by simultaneous plasma-enhanced chemical vapor deposition and physical vapor deposition. To investigate the impact of heat treatment on their structural and morphology evolution in terms of their photocatalytic performance, the as-fabricated films were subjected to different annealing temperatures. The properties of the produced...

article

Preparation of nanoparticle-embedded thin films by simultaneous feeding of gaseous and solid raw materials in plasma-enhanced chemical vapor deposition process

Masaru Kubo, Tomoya Taguchi, Manabu Shimada

Thin Solid Films > 2017 > 632 > C > 55-65

Titania (TiO₂) films in which silica (SiO₂) nanoparticles are embedded (SiO₂/TiO₂ films) are prepared by a combination of a novel aerosolization technique and plasma-enhanced chemical vapor deposition (PECVD). Using titanium tetraisopropoxide (TTIP) in a microwave plasma field, anatase films are prepared on silicon and quartz-glass substrates. By utilizing Coulomb explosion of charged droplets in...

article

Evaluation of the parameters utilized for the aerosol-assisted synthesis of HKUST-1

Masaru Kubo, Teruaki Saito, Manabu Shimada

Microporous and Mesoporous Materials > 2017 > 245 > C > 126-132

In this study, HKUST-1 (Cu₃(BTC)₂; BTC³⁻ = 1,3,5-benzenetricarboxylate) is synthesized by conventional batch synthesis (BS) and novel aerosol-assisted synthesis (AAS), and the effects of various synthesis conditions are investigated. AAS involves the spraying of an HKUST-1 precursor solution through a two-fluid nozzle and subsequent drying, which continuously generates spherical HKUST-1 nanoparticle...

article

Fabrication of TiO2‒Ag nanocomposite thin films via one-step gas-phase deposition

K. Kusdianto, Dianping Jiang, Masaru Kubo, Manabu Shimada

Ceramics International > 2017 > 43 > 6 > 5351-5355

In this work, TiO₂‒Ag nanocomposite thin films were fabricated for the first time via simultaneous plasma-enhanced chemical vapor deposition and physical vapor deposition of TiO₂ and Ag nanoparticles in the gas-phase, respectively. The presence of Ag nanoparticles in the prepared nanocomposites has been confirmed using transmission electron microscopy and energy dispersive X-ray spectrometry techniques...

article

Fabrication of a metal oxide layer on a multi-walled carbon nanotube surface by in-flight coating using gas-phase deposition

Masaru Kubo, K. Kusdianto, Hidetaka Masuda, Manabu Shimada

Ceramics International > 2016 > 42 > 7 > 9162-9169

Understanding the mechanism of the formation of a coating layer on the surface of multi-walled carbon nanotubes (MWCNTs) is a critical issue in coating technology applications. By understanding this mechanism, the structure of the coating layer can be easily controlled. In the present study, the objective is to investigate the effect of alkoxy groups on the formation of a coating layer on MWCNT surfaces...

article

Comparison between whole-body inhalation and nose-only inhalation on the deposition and health effects of nanoparticles

Takako Oyabu, Yasuo Morimoto, Hiroto Izumi, Yukiko Yoshiura, more

Environmental Health and Preventive Medicine > 2016 > 21 > 1 > 42-48

Objectives We performed the two inhalation exposures, whole-body inhalation and nose-only inhalation, to investigate the pulmonary deposition and health effects of the two inhalation methods. Methods In both methods, we exposed rats to the same TiO₂ nanoparticles at almost the same exposure concentration for 6 h and compared the deposited amounts of nanoparticles and histopathological changes in...

article

In-flight coating of multi-walled carbon nanotubes

Masaru Kubo, Hirofumi Kadomura, Manabu Shimada

Materials Letters > 2015 > 155 > C > 114-117

The coating of multi-walled carbon nanotubes (MWCNTs) with TiO_x and SiO_x films was demonstrated by combining MWCNT aerosolization and plasma-enhanced chemical vapor deposition. A uniform coating on the entire MWCNT surface was achieved through isotropic transport of the coating materials onto the aerosolized MWCNTs. The coating layers had different morphologies depending on the composition of the...

article

Pulmonary toxicity of well-dispersed cerium oxide nanoparticles following intratracheal instillation and inhalation

Yasuo Morimoto, Hiroto Izumi, Yukiko Yoshiura, Taisuke Tomonaga, more

Journal of Nanoparticle Research > 2015 > 17 > 11 > 1-16

We performed inhalation and intratracheal instillation studies of cerium dioxide (CeO₂) nanoparticles in order to investigate their pulmonary toxicity, and observed pulmonary inflammation not only in the acute and but also in the chronic phases. In the intratracheal instillation study, F344 rats were exposed to 0.2 mg or 1 mg of CeO₂ nanoparticles. Cell analysis and chemokines in bronchoalveolar lavage...

article

Evaluation of the factors that influence the fabrication of porous thin films by deposition of aerosol nanoparticles

Masaru Kubo, Yu Ishihara, Yuki Mantani, Manabu Shimada

Chemical Engineering Journal > 2013 > 232 > Complete > 221-227

In this study, porous films were fabricated by gas-phase deposition of nonagglomerated metal oxide nanoparticles generated in a plasma field. The effects of several factors including the deposition mechanism, nanoparticle dispersibility, and nanoparticle diameter on the porous morphology were investigated systematically. Careful tuning of the generation conditions led to the generation of nonagglomerated...

article

Effect of organic groups on hydrogen adsorption properties of periodic mesoporous organosilicas

Masaru Kubo, Keisuke Ishiyama, Atsushi Shimojima, Tatsuya Okubo

Microporous and Mesoporous Materials > 2012 > 147 > 1 > 194-199

We investigate the hydrogen adsorption properties of periodic mesoporous organosilicas (PMOs) and focus, in particular, on how these properties are affected by diverse organic groups embedded in the walls. PMOs with π electrons on the pore surface adsorb more hydrogen molecules per unit area and have a higher isosteric heat of hydrogen adsorption (Q _st ). The number of adsorbed hydrogen molecules...

article

Porous Siloxane–Organic Hybrid with Ultrahigh Surface Area through Simultaneous Polymerization–Destruction of Functionalized Cubic Siloxane Cages

Watcharop Chaikittisilp, Masaru Kubo, Takahiko Moteki, Ayae Sugawara-Narutaki, more

Journal of the American Chemical Society > 2011 > 133 > 35 > 13832 - 13835

article

Investigation on specific adsorption of hydrogen on lithium-doped mesoporous silica

Masaru Kubo, Hiroshi Ushiyama, Atsushi Shimojima, Tatsuya Okubo

Adsorption > 2011 > 17 > 1 > 211-218

This paper reports the synthesis, structure, and hydrogen adsorption property of Li-doped mesoporous silica (MPS) with a 2D hexagonal structure. The Li-doping is achieved by impregnation of the cylindrical mesopores with an ethanol solution of lithium chloride followed by heat treatment. Detailed characterization by solid-state NMR, TG-MS, and FT-IR suggests that, during the heat treatment, lithium...

article

Oriented Films of Porous Coordination Polymer Prepared by Repeated in Situ Crystallization

Masaru Kubo, Watcharop Chaikittisilp, Tatsuya Okubo

Chemistry of Materials > 2008 > 20 > 9 > 2887 - 2889

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